13416561 has 6 divisors (see below), whose sum is σ = 19379490. Its totient is φ = 8944368.

The previous prime is 13416551. The next prime is 13416563. The reversal of 13416561 is 16561431.

13416561 is a `hidden beast` number, since 1 + 3 + 4 + 1 + 656 + 1 = 666.

13416561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 8381025 + 5035536 = 2895^2 + 2244^2 .

It is not a de Polignac number, because 13416561 - 2⁶ = 13416497 is a prime.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (13416563) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 745356 + ... + 745373.

It is an arithmetic number, because the mean of its divisors is an integer number (3229915).

Almost surely, 2^13416561 is an apocalyptic number.

It is an amenable number.

13416561 is a deficient number, since it is larger than the sum of its proper divisors (5962929).

13416561 is a wasteful number, since it uses less digits than its factorization.

13416561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1490735 (or 1490732 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 13416561 is about 3662.8624052781. The cubic root of 13416561 is about 237.6185838098.

Adding to 13416561 its reverse (16561431), we get a palindrome (29977992).

The spelling of 13416561 in words is "thirteen million, four hundred sixteen thousand, five hundred sixty-one".